Chair aggregates

ABSTRACT

A chair aggregate comprises seat and back rest members adjustably mounted in a chair frame having front and rear leg pairs rested on a supporting frame which is provided with wheels for supporting the chair aggregate on a floor.

United States Patent 1191 Svensson [45] M 14, 1974.

[ CHAIR AGGREGATES 834,376 10/1906 Flindall 297 327 1,261,396 4/1918 Jackman 297 326 x [75] lnvemor- 1,743,904 1/1930 Russell 297/010. 4 Sweden 1,984,311 12/1934 Lumaretal. 297/1310. 4 2,829,704 4/1958 Hallen et 61... 297/328 x [73] Asslgnee' Skand' Form W Sweden 3,123,397 3/1964 Murcott 297/010. 4 [22] Filed: July 20, 1972 Prima Examiner-Paul R. Gilliam 21 A 1. N .1 273,499 I 1 pp D Attorney, Agent, or Firm-Eugene E. Geoffrey 52 0.5.01. 297/326 51 lm. c1 A476 1/02, A470 1/06, A47 1/12 [57] ABSTRACT [58] Field 61 Search 297/325, 326, 327, 328, A chair aggregate Comprises Seat and back rest 297/DIG. 4-, 18, 319, 320;'248/397 bers adjustably mounted in a chair frame having front and rear leg pairs rested 011 a supporting frame which [56] References Cited is provided with wheels for supporting the chair aggre- UNITED STATES PATENTS gate on a 525,959 9/1894 Martin 297/327 x 3 Claims, 4 Drawing Figures PATENTEUHAY 141974 satin er 2- FIG.)

v G 2 v @W i J M 3 0 2 1 a J J 3 PATENTED AY 14 ran sum 2' or CHAIR AGGREGATES It has already been suggested to arrange the seat and back rest members of chairs so that they are relatively movable, for example in seats of motor vehicles and aircraft, and primarily the angular position of the back rest member to the seat proper is adjustable in such cases. In lounge chairs it is besides customary that in connection with the rearward swinging movement of the back rest member the seat member is shifted in a horizontal forward direction. Wheeled chairs are also previously known, in which the wheelsusually are in.

the form of small rollers which are fixedly or pivotally mounted to the chair legs. These prior art chairs are impractical in many respects int.al. because their wheels often are so small that it is impossible on the whole to roll forth the chair ever say a thick carpet. Besides, it may be very difficult for old people or handicapped persons to get out of a chair of the previously known type without aid when it is in position of rest because the back rest member in said position often takes a substantially horizontal orientation. A further drawback of the prior art chairs is that foot rests are usually lacking in such chairs.

One object of the present invention is to provide a chair aggregate in which the position of inclination of the back rest member and that of the seat member are coordinated to provide the best possible seating position and also the most convenient position to permit a person seated in the chair toget out of the chair 'with the least possible efforts, said chair being easy to move with the aid of a wheeled supporting frame.

A further object of the invention is to provide an ad justable chair for such an aggregate, said chair being suitable for use also without the wheeled supporting frame.

The invention will be more fully described hereinbelow with reference to the accompanying drawings in which:

FIG. I is a side view of a chair aggregate according to the invention;

FIG. 2 on a larger scale is a vertical section of a portion of the chair proper;

FIGS. 3 and 4 are a side view and a plan view, respectively, of a wheeled supporting frame.

FIGS. 1 and 2 show that the chair associated with the chair aggregate has front and rear leg pairs 1 and 2, respectively, which are rigidly interconnected by means of longitudinal and transverse connecting members 3 and arm rest members 4 to form a rigid chair frame. The rear transverse member 5 of the chair seat 12 and the lower transverse member 6 of the back rest member 13 are hingedly interconnected by hinges 7 which have a horizontal hinge axis and are fastened to the respective members. At the front end 14 of the seat an arm 10 is fastened on each side of the seat by means of a pivot pin 11 which is pivotally mounted in a bushing 18 in the adjoining front leg 1 of the chair, so that the seat is swingable about a front horizontal axis. Elongated arms 15 are fastened to the sides of the back rest member and at some distance above the seat, said arms 15 being spaced from and extending transversely to the horizontal pivot axis of the hinges 7 and transversely to the longitudinal direction of the back rest member. Each arm has a series of engagement means in the form ofdownwardly open recesses 17. Adjacent each arm 15 there is a series of cooperating engagement means in 2. the form of pins 16 mounted on the adjacent rear leg 2 in avertical row so that the pins are positioned at different distancesfrom the horizontal axis of the hinges 7. Any ofthe recesses 17 of the arm 15'can engage anyone. ofthe adjacentpins. l6for supporting the back rest member 13; on the chair frame. I

For adjustment of the chair into different positions of inclination of the seat and back rest members the latter is raised to release the engagement between a recess 17 of the arm 15 and a pin 16.0f the leg 2, whereupon a suitable recess is caused to engage another pin 16 under mutual swinging. movement of the seat member and the back rest memberaboutthe hinges 7 and under pivotment of the seat member about the arms 10. The chair is adjustable into several different positions, includinganextreme position in which the seat member is substantially horizontal andthe back rest member is almost vertical, and an extreme position in which the rear part of the seat member has been lowered considerably and the back. restmember occupies a rearwardly inclinedposition. Said two extreme positions are illustrated in FIG. 2.

To arrange for easy mobility of the chair it is placed upon a supporting frame shown in FIGS. 3 and 4 and generally designated 20, said supporting frame having wheels 27, 28; In the embodiment illustrated the supporting frame 20 has two longitudinal frame parts 21. Each of said frame parts consists of a front and-a rear portion which are relatively telescoping. The frame partsmay preferably be steel tubes of circular or rectangular'cross section. At their rear and front ends the frame parts are bent twice such that they first are obliquely inclined upwardly from the floor and then run in parallel again with said floor. The supporting frame 20 further has two cross pieces 22 of U-shaped cross section, which interconnect the longitudinal frame parts 21 and turn their U-limbs 22' upwardly. The crosspieces 22 may preferably be fastened to the frame parts by welding and in addition to their uniting function they are intended to serve as supports for the two legpairs l and 2 of the chair which are placed on the cross pieces between the U-limbs thereof. Owing to the telescoping capacity of the front and rear portions of the frame parts 21 the distance between the cross pieces 22 can be adjusted such that the supporting frame 20 can be used also for other chairs than the one for whichiit is intended. The front and rear portions of the frame parts are locked in correct longitudinal position by two locking mechanisms 23 which are placed internally at the rear ends of the front portions of the frame parts. Further, the supporting frame 20 has at its front end a foot rest 24which can be swung out of the way in an upward direction. Said foot rest has the lower side of its rear edge fastened and pivoted to a transverse axis.25. In its downwardly folded, substantially horizontal position the foot rest rests on two lugs 26. These lugs are fastened to the extreme front ends of the longitudinal frame parts 21 at the lower sides thereof and extend inwardly therefrom. In the upwardly folded, substantially vertical position of the foot rest 24 the front, or in this position upper, edge of the foot rest engages the front leg pair 1 of the chair. The supporting frame 20 rests on four wheels. The front wheels 27 are pivoted to the lugs 26 and the rear wheels 28 which may preferably be arranged so as to permit braking, are pivoted to the rear ends of the longitudinal frame parts. All four wheels preferably are of the caster type and of large diameter (about I mm) such that the chair aggregate is easily rolled forth over say a thick carpet.

What I claim and desire to secure by Letters Patent 1. An adjustable chair comprising a chair frame having front and rear legs a seat member pivotally secured to the front of said chair frame, a back rest member hinged at its lower edge to the rear edge of said seat member for movement about a horizontal axis, cooperating adjustable supporting means on said back rest member and said chair frame for adjustably positioning said back rest and seat members and including at least one elongated rearwardly extending arm rigidly secured to said back member at a point spaced upwardly from said horizontal axis, said arm having a plurality of spaced engaging means, and arm cooperating means secured to said chair frame having a plurality of engaging means selectively cooperating with the engaging means of said arm, the last said engaging means being spaced vertically at different distances from said horizontal axis, whereby the back and seat members can be placed in a plurality of different positions by engagement of a selected one of each of the engaging means on said arm with a selected one of the plurality engaging means on said chair frame.

2. An adjustable chair according to claim 1 wherein said arm includes a plurality of notches in the under side thereof and said arm cooperating means secured to the chair frame includes a plurality of vertically spaced pins.

3. An adjustable chair according to claim 2 wherein said supporting means includes a pair of said arms secured to opposite sides of said back and a pair of arm cooperating means carried at opposite sides of said chair frame. 

1. An aDjustable chair comprising a chair frame having front and rear legs a seat member pivotally secured to the front of said chair frame, a back rest member hinged at its lower edge to the rear edge of said seat member for movement about a horizontal axis, cooperating adjustable supporting means on said back rest member and said chair frame for adjustably positioning said back rest and seat members and including at least one elongated rearwardly extending arm rigidly secured to said back member at a point spaced upwardly from said horizontal axis, said arm having a plurality of spaced engaging means, and arm cooperating means secured to said chair frame having a plurality of engaging means selectively cooperating with the engaging means of said arm, the last said engaging means being spaced vertically at different distances from said horizontal axis, whereby the back and seat members can be placed in a plurality of different positions by engagement of a selected one of each of the engaging means on said arm with a selected one of the plurality engaging means on said chair frame.
 2. An adjustable chair according to claim 1 wherein said arm includes a plurality of notches in the under side thereof and said arm cooperating means secured to the chair frame includes a plurality of vertically spaced pins.
 3. An adjustable chair according to claim 2 wherein said supporting means includes a pair of said arms secured to opposite sides of said back and a pair of arm cooperating means carried at opposite sides of said chair frame. 